Abstract
(1) Worli village is badly infested with rats, practically all M. rattus.(2) Persistent trapping for one year appeared to reduce the rat population to approximately one quarter of the original number.(3) Three cases of plague which occurred in the village were investigated. It is probable that these three cases all contracted the infection outside the village.(4) In two instances there is evidence which points to infection having been introduced in the clothing or persons of people, and of this spreading in one instance to a guinea-pig, and in the other instance to rats.

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